I have been playing是主谓结构吗?

I have been playing是主谓结构吗? I have been playing piano for ten years.同义句I have been playing piano____ten years____ have been playing是什么意思 You look so tired .yes,I have been playing basketball I have been there,have been 是have been in还是have been to的缩写? I have been playing the piano since I _(be) 6 years old.填was,been,还是其他的什么? I have been playing with the dog.(提问）____ _____ you ______ _______? I have been sick since yesterday.中have been 是什么是时态为什么要用been. the children may have been playing in the garden.哪个是助动词 修饰语 实义动词? I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. i have been a perfect ass 如果是 have i been a perfect ass 这个 i 和 have play with 的用法一个句子I was playing tennis ___my school team.其中介词用in还是with?因为有个例句是I have been training with my school team.